How many copies has Kerbal Space Program sold?

indielist estimates Kerbal Space Program has sold between 7,484,526 and 17,463,894 units (median 12,474,210), derived from its 118,802 Steam reviews with the white-box Boxleiter v1.0 method. The full breakdown is shown on the page.

Who developed Kerbal Space Program?

Kerbal Space Program was developed by Squad and published by Private Division.

Who published Kerbal Space Program?

Kerbal Space Program was published by Private Division, developed by Squad. See Private Division's full catalogue and submission status on indielist.

When was Kerbal Space Program released?

Kerbal Space Program was released in 2015.

How many reviews does Kerbal Space Program have on Steam?

Kerbal Space Program has 118,802 Steam reviews, of which 96% are positive.

Is Kerbal Space Program worth playing?

Steam players rate Kerbal Space Program 96% positive across 118,802 reviews. indielist doesn't score games editorially; it surfaces public review sentiment and a white-box sales estimate so you can judge reception and reach yourself.

Kerbal Space Program

Apr 27, 2015 Indie $39.99

Developer Squad Publisher Private Division

Profile updated May 2026

Players manage a space program by designing and launching spacecraft in this physics-based simulation. Since its 2015 release, the title has accumulated 78,090 reviews on Steam. The game maintains a 95% positive rating, indicating a high level of user satisfaction within the indie market.

Kerbal Space Program is a 2015 Indie game developed by Squad and published by Private Division. On Steam it has gathered 118,802 player reviews, 96% of them positive, which counts as a overwhelmingly positive reception among indie titles in the Indie category. The game is available on linux, mac, windows, and launched at $40. The pairing of developer Squad with publisher Private Division is one of the studio-publisher relationships indielist tracks, letting players find comparable games and letting developers and investors study how Indie projects reach the market. indielist's white-box method estimates its lifetime sales at roughly 7.5 million to 17.5 million units, with the full Boxleiter factor breakdown shown on this page rather than a single black-box figure. Within indielist's catalog of indie games mapped to their studios, publishers, and funding, Kerbal Space Program can be compared against similar Indie titles and benchmarked on review counts and estimated sales.

Reviews

118,802

Positive

96%

Steam appid

220200

Engine

Unknown

Players (snapshot)

3,290

Fresh snapshot · 2026-07-24 12:35 UTC · 24h peak 4,445

Sales estimate

v1.0

7.5M to 17.5M

units (median: 12.5M)

≈ $171.0M to $398.9M modeled net revenue (fixed store-cut, refund, and regional-price assumptions applied)

7.5M median 17.5M

+ How is this calculated?

118,802 reviews × NB(105) = 12,474,210 median units

Factor	Adjustment
base	+50
year_2015	+30
price_$40	+15
positive_96%	+10
final NB	105

Heuristic display range: median × [0.6, 1.4]. Boundary protection: NB ∈ [15, 150].

Methodology & limitations

Sales estimates use an additive Boxleiter-derived heuristic against public Steam review counts. They are not authoritative sales data, and the fixed display range is not a statistically validated confidence interval. Actual results may fall outside it, especially for deeply discounted or bundle-heavy titles. Algorithm version v1.0. Read the exact method and validation status.

indielist estimates lifetime unit sales for Kerbal Space Program at roughly 7.5 million to 17.5 million copies, with a median around 12.5 million, derived from its 118,802 Steam reviews using a multi-factor Boxleiter method (version v1.0). That median maps to approximately $284.9M in net revenue after Steam's 30% cut, regional pricing, and refunds. Unlike black-box trackers, the full calculation is shown on this page: a base review-to-sales multiplier is adjusted for release year, launch price, review sentiment, studio size, and genre, and every adjustment is listed so developers, publishers, and investors can audit exactly how the figure was reached. The range itself reflects genuine uncertainty — review-to-sales ratios vary widely between games — so indielist publishes a low, median, and high band rather than a false-precision single number, and treats free-to-play, heavily discounted, and bundle-distributed titles as having wider error margins still.

Price history

55 observed days · window low $9.30

Across 55 observed UTC days from 2026-05-15 to 2026-07-24, the daily lowest tracked USD price across stores ranged from $9.30 to $38.65. The tracked-window low was $9.30 on 2026-06-20.

Real store observations · daily lowest tracked USD price across stores · missing days are not filled.

Where to buy

Affiliate disclosure

GOG.com -75%

$9.99 Buy
Fanatical -10%

$37.89 Buy
Steam reference

$39.99 Buy
Green Man Gaming

$39.99 Buy
Humble Store

$39.99 Buy

Latest tracked store observations (2026-07-24 04:52 UTC), cheapest first. Prices may have changed since observation. Some are affiliate links — we may earn a commission at no extra cost to you. Learn more.

Platforms

linuxmacwindows

Frequently asked questions

How many copies has Kerbal Space Program sold?: indielist estimates Kerbal Space Program has sold between 7,484,526 and 17,463,894 units (median 12,474,210), derived from its 118,802 Steam reviews with the white-box Boxleiter v1.0 method. The full breakdown is shown on the page.
Who developed Kerbal Space Program?: Kerbal Space Program was developed by Squad and published by Private Division.
Who published Kerbal Space Program?: Kerbal Space Program was published by Private Division, developed by Squad. See Private Division's full catalogue and submission status on indielist.
When was Kerbal Space Program released?: Kerbal Space Program was released in 2015.
How many reviews does Kerbal Space Program have on Steam?: Kerbal Space Program has 118,802 Steam reviews, of which 96% are positive.
Is Kerbal Space Program worth playing?: Steam players rate Kerbal Space Program 96% positive across 118,802 reviews. indielist doesn't score games editorially; it surfaces public review sentiment and a white-box sales estimate so you can judge reception and reach yourself.

Players looking for games like Kerbal Space Program can compare it on indielist against semantically similar Indie titles such as Kerbal Space Program 2, Oxygen Not Included, Spaceflight Simulator, Automation - The Car Company Tycoon Game, ranked by shared tags and genre rather than by ad spend. On the developer side, Squad's other releases and Private Division's wider catalog are one click away, letting developers benchmark where Kerbal Space Program sits among a studio's body of work and how its publisher's portfolio performs. Because indielist maps studios, publishers, games, and funding into one connected graph, the same Kerbal Space Program page serves three audiences at once: players hunting their next Indie game, developers studying how comparable projects were positioned and what they sold, and investors tracing which teams and labels are active in the space. A machine-readable markdown mirror of this page is published at the same path with a .md suffix for AI assistants, and its review, price, and sales-estimate figures are refreshed on a schedule rather than frozen at launch.

Matched from shared Steam tags and primary genre. Review count breaks ties; it is not a personal recommendation score.